Looking at NOAA's forecast... looks like the fog will return in the morning though it won't be too deep.
They are calling for wind in the Delta starting Friday and it looks like to could last till next weekend with cooler temps all through the week...

.DISCUSSION...
TODAY LOOKS TO BE THE HOTTEST OF THIS STRETCH OF HEAT. IN
RESPONSE TO A WEAK LOW APPROACHING THE PACIFIC NW TONIGHT THE
BREEZE THOUGH THE DELTA SHOULD INCREASE THIS EVENING. THE BAD NEWS
IS THERE IS NO STRATUS ALONG THE COAST SO THE AMOUNT OF COOLING
WILL NOT BE AS GREAT AS IF WE HAD A SOLID STRATUS DECK OF CLOUDS
COOLING THE COAST. SACRAMENTO AND THE DELTA WILL BENEFIT THE MOST
BY THIS INCREASE IN WIND THROUGH THE DELTA BUT EXPECT ANOTHER WARM
NIGHT WITH ONLY SLIGHTLY COOLER TEMPERATURES FOR EVERYONE ELSE.
EXPECT ANOTHER HOT DAY ON FRIDAY WITH TEMPERATURES ONLY A FEW
DEGREES COOLER THAN TODAYS HIGHS. AS A TROUGH APPROACHES AND
DEEPENS OVER THE REGION FRIDAY NIGHT AND SATURDAY EXPECT COOLER
TEMPERATURES AND BETTER
FLOW THROUGH THE DELTA.

SATURDAY NIGHT INTO SUNDAY BEHIND THE TROUGH HIGHER SURFACE
PRESSURE BUILDS OVER WESTERN OREGON THAT SHOULD PRODUCE SOME
BREEZY CONDITIONS...PARTICULARLY OVER THE NORTHERN HALF OF THE
SACRAMENTO VALLEY AND OVER THE NORTHERN COASTAL RANGE.
TEMPERATURES SHOULD WARM UP AS WELL CLOSE TO 100 DEGREES FOR MANY
VALLEY LOCATIONS. TEMPERATURES LOOK TO REMAIN VERY WARM THROUGH
EARLY NEXT WEEK BEFORE GRADUALLY COOLING THROUGH THE MID TO LATTER
PART OF NEXT WEEK. BY THAT TIME PERIOD COASTAL STRATUS SHOULD
RETURN AS WELL AS LONG AS THE TROUGH JUST OFF THE WEST COAST OF
CANADA DEVELOPS AS CURRENTLY IS MODELED BY THE GFS.